Egg production of Calanus finmarchicus : effect of temperature, food and season

1997 ◽  
Vol 127 (4) ◽  
pp. 609-620 ◽  
Author(s):  
H.-J. Hirche ◽  
U. Meyer ◽  
B. Niehoff
Keyword(s):  
Egg Production ◽  
Calanus Finmarchicus ◽  
Effect Of Temperature

scholarly journals Effect of temperature on egg production in the common housefly

2020 ◽  
Vol 168 (6-7) ◽  
pp. 513-522 ◽  
Author(s):  
Ljubinka Francuski ◽  
Walter Jansen ◽  
Leo W. Beukeboom
Keyword(s):  
Egg Production ◽  
Effect Of Temperature ◽  
The Common

scholarly journals Characteristics of egg production of the planktonic copepod, Calanus finmarchicus, in the Labrador Sea: 1997–2010

2012 ◽  
Vol 35 (2) ◽  
pp. 281-298 ◽  
Author(s):  
Erica J. H. Head ◽  
Leslie R. Harris ◽  
Marc Ringuette ◽  
Robert W. Campbell
Keyword(s):  
Egg Production ◽  
Calanus Finmarchicus ◽  
Labrador Sea ◽  
Planktonic Copepod

Seasonal variation in the egg production of fowls: effect of temperature and change of day length

1957 ◽  
Vol 49 (4) ◽  
pp. 419-434 ◽  
Author(s):  
J. C. D. Hutchinson ◽  
W. W. Taylor
Keyword(s):  
Egg Production ◽  
Late Summer ◽  
Day Length ◽  
Phase Iii ◽  
Effect Of Temperature ◽  
Detectable Effect ◽  
Production Phase ◽  
Supplementary Lighting ◽  
Autumn And Winter ◽  
Phase Iv

1. Two groups of pullets were reared on a 12 and a 23½ hr. day length respectively and at an environmental temperature of 64–65° F. Two months after the first bird came into lay, the day length of the second group was reduced to 12 hr. over a period of about 8 weeks (phase I).2. Both groups came into production at the same time, but the group reared on a 23½ hr. day grew more rapidly.3. The reduction in day length caused moulting and low production for several months, whereas the group which had been reared in a 12 hr. day continued to lay steadily.4. Soon after the reduction of day length half of each group (subgroups B and D) was exposed to an artificial thermal autumn and winter, which had no detectable effect on production (phase II). After this the temperature was allowed to rise to 64–65° F.5. When the day length of the remaining birds (subgroups A and C), still kept at 64–65° F., was increased to 23½ hr., there was no significant increase in production (phase III).6. When their day length was then reduced to 12 hr., they moulted heavily and went out of production (phase IV).7. Simultaneously the day length of subgroups B and D was increased to 16J hr. (phase IV). This had no significant effect on production.8. The yield of the birds which had their day length reduced at the beginning of the experiment was twenty-three ovulations less than that of the others at the end of the artificial winter, and nineteen less at the end of the laying year. The laying year was concluded before phase IV. There was no difference in yield between the birds which had an artificial autumn and winter and those which lived in a warm environment.9. Data are given on the frequency distribution of the yield after a reduction in day length, over the remainder of the year, and also on the correlation between the yields in these two periods.10. The eggs of the group reared in a 23½ hr. day length tended to be larger than those of the other group in conformity with their larger body weight. Apart from this the various treatments had no effect on egg weight.11. There was no relation between the egg yields and the variations in absolute and relative humidity.12. In a subsidiary experiment it was found that, if the reduction in day length was completed a month before the birds began to lay, there was no significant effect on subsequent production.13. In the light of these experiments it seems that the essential cause of winter pause and the annual rest, in birds given supplementary lighting, is the decline in day length in late summer and autumn.

Limitation of egg production in Calanus finmarchicus in the field: A stoichiometric analysis

2009 ◽  
Vol 78 (4) ◽  
pp. 511-517 ◽  
Author(s):  
Daniel J. Mayor ◽  
Thomas R. Anderson ◽  
David W. Pond ◽  
Xabier Irigoien
Keyword(s):  
Egg Production ◽  
Calanus Finmarchicus ◽  
Stoichiometric Analysis

Diel variations in Centropages tenuiremis (Copepoda) feeding, spawning and its relationship with temperature

2012 ◽  
Vol 93 (3) ◽  
pp. 645-649 ◽  
Author(s):  
Lisheng Wu ◽  
Qiujing Gao ◽  
Guizhong Wang ◽  
Yusha Liu
Keyword(s):  
Egg Production ◽  
Seawater Temperature ◽  
Circular Statistics ◽  
Effect Of Temperature ◽  
Peak Time ◽  
Night Time ◽  
Xiamen Bay ◽  
Feeding Activities ◽  
Feeding Rhythms ◽  
Lag Times

Diel rhythms in feeding and spawning were investigated in Centropages tenuiremis from Xiamen Bay in March to May, 2006. Circular statistics were used to determine the peak time of spawning. The results showed that the feeding activities of females were stably higher at night-time, and there was a remarkable earlier shift in spawning peak time with warmer seawater. Thus, the lag times between peak times of gut pigment content and spawning were shortened with the increase of temperature. It suggested that there was a direct effect of feeding rhythms on egg production variations in copepods, and the seawater temperature would work on the converting time and then influence the spawning peak time. So the effect of temperature cannot be ignored in the investigation of the effects of feeding on egg production.

Life cycle of Calanus finmarchicus in the lower St. Lawrence Estuary: the imprint of circulation and late timing of the spring phytoplankton bloom

2001 ◽  
Vol 58 (4) ◽  
pp. 647-658 ◽  
Author(s):  
Stéphane Plourde ◽  
Pierre Joly ◽  
Jeffrey A Runge ◽  
Bruno Zakardjian ◽  
Julian J Dodson
Keyword(s):  
Population Dynamics ◽  
Life Cycle ◽  
Production Rate ◽  
Egg Production ◽  
Phytoplankton Bloom ◽  
Food Limitation ◽  
Calanus Finmarchicus ◽  
Lawrence Estuary ◽  
Egg Production Rate ◽  
St Lawrence Estuary

The life cycle of Calanus finmarchicus in the lower St. Lawrence estuary is described based on observations of female egg production rate, population stage abundance, and chlorophyll a biomass collected over 7 years (1991–1997) at a centrally located monitoring station. The mean seasonal pattern shows maximum abundance of females in May, but peak population egg production rate and naupliar (N3–N6) abundance occur in early July just after onset of the late spring – early summer phytoplankton bloom. The population stage structure is characterized by low summer abundance of early copepodite stages C1–C3 and high stage C5 abundance in autumn. Between 1994 and 1997, there was important interannual variation in both timing (up to 1 month) and amplitude (five- to eight-fold) of population reproduction. Patterns of seasonal increase of C5 abundance in autumn suggest interannual variations of both timing and magnitude of deep upstream advection of this overwintering stage. Thus, the main features of C. finmarchicus population dynamics in the central lower St. Lawrence Estuary are (i) late reproduction resulting from food limitation prior to the onset of the summer phytoplankton bloom, (ii) probable export of early developmental stages during summer, and (iii) advection into the central lower St. Lawrence Estuary of overwintering stage C5 in autumn from downstream regions. These results support the hypothesis that circulation, mainly driven by discharge from the St. Lawrence River and its tributaries, is a key factor governing population dynamics of C. finmarchicus in this region.

Temperature, Size and Egg Production in the Cabbage Butterfly, Pieris Rapae L.

1982 ◽  
Vol 30 (2) ◽  
pp. 223 ◽  
Author(s):  
RE Jones ◽  
JR Hart ◽  
GD Bull
Keyword(s):  
High Temperatures ◽  
Low Temperatures ◽  
Egg Production ◽  
Pieris Rapae ◽  
Effect Of Temperature ◽  
Pupal Weight ◽  
Larval Diet ◽  
Young Females ◽  
Rearing Conditions ◽  
High Degree

Larvae reared at low temperatures produce larger pupae and adults than those reared at high temperatures, and pupal weight is linearly related to lifetime egg production; mean egg production in a group reared at 29-3l�C may be twice that of another reared at 17.5-19�C. The number of eggs visible with a dissecting microscope in the ovaries of young females is not proportional to their lifetime production. Once size is taken into account, there is no additional effect of temperature or larval diet on total egg production. The timing of egg production throughout an adult's life is unaffected by its size or by the conditions in which it was reared. but there are marked differences between Australian and Canadian (Vancouver) individuals. The size of eggs is inversely correlated with both the age and the size of the mother. In any particular set of rearing conditions, males tend to be larger than females, and the sexes show an equal and high degree of variation in size.

Characteristics of egg production of the planktonic copepod, Calanus finmarchicus, on Georges Bank: 1994–1999

2006 ◽  
Vol 53 (23-24) ◽  
pp. 2618-2631 ◽  
Author(s):  
J.A. Runge ◽  
S. Plourde ◽  
P. Joly ◽  
B. Niehoff ◽  
E. Durbin
Keyword(s):  
Egg Production ◽  
Calanus Finmarchicus ◽  
Georges Bank ◽  
Planktonic Copepod

Diet composition and quality for Calanus finmarchicus egg production and hatching success off south-west Iceland

2002 ◽  
Vol 140 (6) ◽  
pp. 1195-1206 ◽  
Author(s):  
Jónasdóttir S. ◽  
Gudfinnsson H. ◽  
Gislason A. ◽  
Astthorsson O.
Keyword(s):  
Egg Production ◽  
Diet Composition ◽  
Hatching Success ◽  
Calanus Finmarchicus ◽  
South West
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